Users Manual & Installation Guide
PV- 1800: Power supply module with GSM MODEM
Analogue inputs (CN5)
The
Depending on the model – see section ordering codes – each input will have a full scale of 2.5V, 5.0V, 10V, or 20mA. The table shows the connector layout:
| Pin no |
| Name |
| Pin no |
|
| 1 |
| Analogue GND |
| 1 |
|
|
|
|
| |||
| 2 |
| Analogue input#7 |
| 6 |
|
| 3 |
| Analogue input#6 |
| 2 |
|
| 4 |
| Analogue input#5 |
| 7 |
|
| 5 |
| Analogue input#4 |
| 3 |
|
| 6 |
| Analogue input#3 |
| 8 |
|
| 7 |
| Analogue input#2 |
| 4 |
|
| 8 |
| Analogue input#1 |
| 9 |
|
| 9 |
| Analogue input#0 |
| 5 |
|
| 10 |
| +3.3V Isolated |
|
|
|
+.
1#+@5=&6
The input circuitry looks like this:
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The analogue inputs on PV1800 are factory configured by choosing proper values for R1 and R2. In the table the values are shown for the different models. The input resistance is 1M on all voltage input channels. The software interface is explained in section
Configuration | R1 | R2 | |
0 | - 2.5V | 0 ohm | 1 Mohm |
0 | - 5 .0V | 449 Kohm | 449 Kohm |
0 | - 10.0V | 741 Kohm | 246 Kohm |
0 | - 20mA | 0 ohm | 125 ohm |
Differential measurement
The analogue inputs can two by two be used for differential measurement. Inputs, which can make up a pair, are defined in the software. One of the wires, in each pair, is inside the ADC connected as a ‘negative’ input; the other as a ‘positive’ input. The common mode voltage on the ‘negative’ input must not exceed 0.5V in a 0 – 2.5V configuration and 1V in a 0 - 5V configuration. The combinations of the actual inputs used for differential measurement are shown in section -
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